SYMPOSIA PAPER Published: 01 January 1964

The Strength of “Undisturbed” Clay Determined from Undrained Tests


Test data from unconsolidated-undrained (UU) and consolidated-undrained (CU) tests on tube samples of several saturated clays are compared, and the generally large discrepancies in undrained shear strength, Su, are analyzed in terms of changes in effective stress during the sampling process. Data are presented to show that the residual effective stress of laboratory specimens of normally consolidated clay is typically less than one third of the value corresponding to perfect sampling, where only the in situ shear stresses are released.

Author Information

Ladd, CC
Massachusetts Institute of Technology, Cambridge, Mass.
Lambe, TW
Massachusetts Institute of Technology, Cambridge, Mass.
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Developed by Committee: D18
Pages: 342–371
DOI: 10.1520/STP30011S
ISBN-EB: 978-0-8031-4568-9
ISBN-13: 978-0-8031-0048-0